The Suspension capsules are often used in order to make long voyages.
The Thundercats have often used the capsules to travel deep space. The capsules use a gas that slows a persons aging, when exposed to these gasses outside of a capsule it rapidly reverses the persons aging.
- When a young Lion-O entered his capsule and reached Third Earth, he had grown quite a lot, while the Thunderkittens hadn't. The generally accepted explanation by fans is that Lion-o's capsule had malfunctioned.