2/4 The Doctor attempts to repair the TARDIS so that he can affect Romana's rescue.
1/4 With the TARDIS disabled, the Doctor is powerless to act when Romana is kidnapped.
4/4 Unless the Doctor and Romana act quickly, the villains will escape justice.
3/4 The Mandrels have escaped from the Eden projection and are attacking the passengers.
2/4 The Doctor and Romana discover that someone is smuggling the dangerous narcotic, Vraxoin.