diff --git a/src/de/steamwar/misslewars/commands/AcceptCommand.java b/src/de/steamwar/misslewars/commands/AcceptCommand.java
new file mode 100644
index 0000000..b411460
--- /dev/null
+++ b/src/de/steamwar/misslewars/commands/AcceptCommand.java
@@ -0,0 +1,66 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ * /
+ */
+
+package de.steamwar.misslewars.commands;
+
+import de.steamwar.misslewars.Config;
+import de.steamwar.misslewars.MWTeam;
+import de.steamwar.misslewars.MissileWars;
+import de.steamwar.command.SWCommand;
+import de.steamwar.command.TypeValidator;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class AcceptCommand extends SWCommand {
+    public AcceptCommand() {
+        super("accept");
+    }
+
+    @Register
+    public void onCommand(@Validator Player player, String... varargs) {
+        MWTeam teamInvitation = MissileWars.getInvitation(player);
+        if (teamInvitation == null) {
+            player.sendMessage("§cDu wurdest nicht eingeladen.");
+        }
+        else {
+            teamInvitation.acceptInvite(player);
+            message(teamInvitation, "§7Der Spieler §e" + player.getName() + "§7 ist dem Team §abeigetreten§7.");
+        }
+    }
+
+    @ClassValidator(value = Player.class, local = true)
+    public TypeValidator<Player> validator() {
+        return new TypeValidator<Player>() {
+            @Override
+            public boolean validate(CommandSender commandSender, Player player, MessageSender messageSender) {
+                if (Config.isChallenge()) {
+                    messageSender.send("§cDieser Command ist deaktiviert.");
+                    return false;
+                }
+                return true;
+            }
+        };
+    }
+
+    private void message(MWTeam mwTeam, String s) {
+        mwTeam.getPlayers().forEach(player -> player.sendMessage(s));
+    }
+}
diff --git a/src/de/steamwar/misslewars/commands/DeclineCommand.java b/src/de/steamwar/misslewars/commands/DeclineCommand.java
new file mode 100644
index 0000000..a667c80
--- /dev/null
+++ b/src/de/steamwar/misslewars/commands/DeclineCommand.java
@@ -0,0 +1,68 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ * /
+ */
+
+package de.steamwar.misslewars.commands;
+
+import de.steamwar.misslewars.Config;
+import de.steamwar.misslewars.MWTeam;
+import de.steamwar.misslewars.MissileWars;
+import de.steamwar.command.SWCommand;
+import de.steamwar.command.TypeValidator;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+
+public class DeclineCommand extends SWCommand {
+    public DeclineCommand() {
+        super("decline");
+    }
+
+    @Register
+    public void onCommand(@Validator Player player, String... varargs) {
+        MWTeam teamInvitation = MissileWars.getInvitation(player);
+        if (teamInvitation == null) {
+            player.sendMessage("§cDu wurdest nicht eingeladen.");
+        }
+        else {
+            MWTeam.removeInvitations(player);
+            message(teamInvitation, "§7Der Spieler §e" + player.getName() + "§7 hat die Einladung §cabgelehnt§7.");
+        }
+    }
+
+    @ClassValidator(value = Player.class, local = true)
+    public TypeValidator<Player> validator() {
+        return new TypeValidator<Player>() {
+            @Override
+            public boolean validate(CommandSender commandSender, Player player, MessageSender messageSender) {
+                if (!Config.isChallenge()) {
+                    messageSender.send("§cDieser Command ist deaktiviert.");
+                    return false;
+                }
+                return true;
+            }
+        };
+    }
+
+    private void message(MWTeam mwTeam, String s) {
+        mwTeam.getPlayers().forEach(player -> player.sendMessage(s));
+    }
+
+}
diff --git a/src/de/steamwar/misslewars/commands/InviteCommand.java b/src/de/steamwar/misslewars/commands/InviteCommand.java
new file mode 100644
index 0000000..a6b22f3
--- /dev/null
+++ b/src/de/steamwar/misslewars/commands/InviteCommand.java
@@ -0,0 +1,79 @@
+package de.steamwar.misslewars.commands;
+
+import de.steamwar.command.SWCommand;
+import de.steamwar.command.TypeValidator;
+import de.steamwar.misslewars.Config;
+import de.steamwar.misslewars.MWTeam;
+import de.steamwar.misslewars.MissileWars;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import org.bukkit.entity.Player;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class InviteCommand extends SWCommand implements TabCompleter {
+
+    public InviteCommand() {
+        super("invite", "inv");
+    }
+
+    @Register
+    public void onCommand(@Validator Player player, String playerName, String... varargs) {
+        MWTeam team = MissileWars.getTeam(player);
+        Player invitedPlayer = Bukkit.getPlayer(playerName);
+        if (!Config.RedLeader.equals(player.getUniqueId()) && !Config.BlueLeader.equals(player.getUniqueId()) || team == null) {
+            player.sendMessage("§cDu kannst keine Spieler einladen.");
+        }
+        else if (invitedPlayer == null) {
+            player.sendMessage("§cDieser Spieler ist nicht online.");
+        }
+        else if (MissileWars.getTeam(invitedPlayer) != null) {
+            player.sendMessage("§cDieser Spieler ist bereits in einem Team.");
+        }
+        else if (MissileWars.getInvitation(invitedPlayer) != null) {
+            player.sendMessage("§cDieser Spieler wurde bereits eingeladen.");
+        }
+        else {
+            team.invitePlayer(invitedPlayer);
+            player.sendMessage("§7Du hast §e" + invitedPlayer.getName() + " §7eingeladen.");
+            invitedPlayer.sendMessage("§7Du wurdest von §e" + player.getName() + "§7 in das Team §e" + MissileWars.getTeam(player).getColoredName() + "§7 eingeladen.");
+            invitedPlayer.sendMessage("§8/§eaccept §8- §7Zum akzeptieren.");
+            invitedPlayer.sendMessage("§8/§edecline §8- §7Zum ablehnen.");
+        }
+    }
+
+    @Override
+    public List<String> onTabComplete(CommandSender sender, Command command, String label, String[] args) {
+        if (args.length == 1) {
+            return Bukkit.getOnlinePlayers()
+                    .stream()
+                    .filter(p -> MissileWars.getTeam(p) != null)
+                    .filter(p -> MissileWars.getInvitation(p) != null)
+                    .map(Player::getName)
+                    .collect(Collectors.toList());
+        }
+        return new ArrayList<>();
+    }
+
+    @ClassValidator(value = Player.class, local = true)
+    public TypeValidator<Player> validator() {
+        return new TypeValidator<Player>() {
+            @Override
+            public boolean validate(CommandSender commandSender, Player player, MessageSender messageSender) {
+                if (Config.isChallenge()) {
+                    messageSender.send("§cDieser Command ist deaktiviert.");
+                    return false;
+                }
+                return true;
+            }
+        };
+    }
+
+    private void message(MWTeam mwTeam, String s) {
+        mwTeam.getPlayers().forEach(player -> player.sendMessage(s));
+    }
+}
diff --git a/src/de/steamwar/misslewars/commands/SpectateCommand.java b/src/de/steamwar/misslewars/commands/SpectateCommand.java
new file mode 100644
index 0000000..07b0763
--- /dev/null
+++ b/src/de/steamwar/misslewars/commands/SpectateCommand.java
@@ -0,0 +1,65 @@
+/*
+ *
+ *     This file is a part of the SteamWar software.
+ *
+ *     Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU Affero General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU Affero General Public License for more details.
+ *
+ *     You should have received a copy of the GNU Affero General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ * /
+ */
+
+package de.steamwar.misslewars.commands;
+
+import de.steamwar.misslewars.Config;
+import de.steamwar.misslewars.MWTeam;
+import de.steamwar.misslewars.MissileWars;
+import de.steamwar.command.SWCommand;
+import de.steamwar.command.TypeValidator;
+import org.bukkit.GameMode;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+
+public class SpectateCommand extends SWCommand {
+    public SpectateCommand() {
+        super("spectate", "spec");
+    }
+
+    @Register
+    public void onCommand(@Validator Player player, String... varargs) {
+        MWTeam mwTeam = MissileWars.getTeam(player);
+        if (mwTeam == null) return;
+        if (mwTeam.size() == 1) {
+            player.sendMessage("§cDu bist alleine im Team, zuschauen ist daher nicht möglich.");
+        }
+        MissileWars.leave(player);
+        player.setGameMode(GameMode.SPECTATOR);
+        player.getInventory().clear();
+        player.updateInventory();
+    }
+
+    @ClassValidator(value = Player.class, local = true)
+    public TypeValidator<Player> validator() {
+        return new TypeValidator<Player>() {
+            @Override
+            public boolean validate(CommandSender commandSender, Player player, MessageSender messageSender) {
+                if (Config.isChallenge()) {
+                    messageSender.send("§cDieser Command ist deaktiviert.");
+                    return false;
+                }
+                return true;
+            }
+        };
+    }
+}