A gift of a pocket watch from his wife causes a man (Ron Randell) to foresee a murder and attempt to prevent it.
...
https://www.youtube.com/watch?v=hk3-Po3eFO8
The evil Dr.Rootes provoke an incident at Space City Power Plant in order that an alien space ship bring a plant seed which invades the planet. Steve, Venus and Matt must accompany Dr.Rootes to Planet Hedra in order to get an antidote to this sudden vegetal invasion.
...
https://www.youtube.com/watch?v=vtJt8XNc_lY