If you mean MarsCoin (MC), it’s an ERC-20 token and therefore supported by Trezor. See here about how to add it to Trezor Suite. After you’ve done that you can transfer your MC tokens to Trezor.
Note that when you add a new token to Trezor Suite and don’t use it, then it’ll be removed automaticly when you disconnect your Trezor device, because it’s empty.
In Trezor Suite, go to Settings → Crypto and select the coins you want to show. You can also go to the same crypto list directly from Dashboard by pressing the + Enable more coins button/link to the right off the Assets header.