- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
Keel, an old friend of Captain Picard, arranged a secret meeting of four captains on Dytallix B. Keel gathered the captains together to discuss the existence of a possible conspiracy within the Federation.
Following that meeting, the Horatio imploded as it broke orbit, thus cementing Picard's belief in Keel's suspicions.